Syntheses and NLO Properties of Chromium Carbonyl Arene Complexes with Conjugated Side Chains: The Amphoteric Nature of Chromium Carbonyl Complexation in Push−Pull Chromophores
作者:Thomas J. J. Müller、Astrid Netz、Markus Ansorge、Elmar Schmälzlin、Christoph Bräuchle、Klaus Meerholz
DOI:10.1021/om9904551
日期:1999.11.1
(hetero)aromatic aldehydes give rise to numerous alkenylated chromium carbonyl arene complexes (E)n-Cr(CO)3(η6-C6H5)(CHCH)nR1 (6, n = 1−3, R1 = p-C6H4-NMe2, p-C6H4-NO2, 2-(4-nitrothienyl)). The linear (UV/vis spectra) and the nonlinear optical properties (hyper Rayleigh scattering measurements) of the complexes 1, 3, and 6 reveal that the chromium carbonyl arene fragment behaves electronically amphoteric, i.e.
供体和接受体取代炔基化铬,羰基芳烃络合物的Cr(CO)2 L(η 6 -R 1 -C 6 ħ 4)(C⋮C)ñ - [R 2(1,Ñ = 1,L = CO,PPH 3,R 1= H,邻甲酰基,R 2=p- C 6 H 4 -NMe 2,p- C 6 H 4 -NO 2,二茂铁基;3,n= 2,L = CO,R 1。= H,R 2 = p -C 6 H 4 -NMe 2,p -C 6 H 4 -NO 2,二茂铁基)很容易通过氯芳烃配合物的Sonogashira炔基化反应和溴炔与复合苯基乙炔1a的Cadiot-Chodkiewicz偶联容易地获得(n= 1,L = CO,R 1= R 2= H)。Cr(CO)3络合的苄基膦酸酯和(杂)芳族醛的Horner-Emmons-Wadsworth烯化反应生成许多烯基化羰基铬芳烃络合物(E)n-Cr(CO)3(η 6 -C 6 H ^ 5)(CH CH)ñ